JLG-DimensionLight (CC).aip,
JLG-DimensionLight-Prefs.txt,
BipPoint.wav,
BipSegment.wav,
BipArc.wav and
BipBezier.wav
have to be placed in the Plug-ins folder of Illustrator.

When you launch Illustrator, if you have an error message saying that JLG-DimensionLight-Prefs.txt was not found, though it is in the Plug-Ins folder, you have to change the properties of the file JLG-DimensionLight-Prefs.txt.

Right click on the file JLG-DimensionLight-Prefs.txt then choose Properties.
Click Modifie and check all the check boxes Allow.

When you relaunch Illustrator, you should not have the error message.

For more details, read the pdf dimensionlightmodeemploius.pdf (pages 1 and 2).